High conductivity carbon nanotube wires from radial densification and ionic doping

Application of drawing dies to radially densify sheets of carbon nanotubes (CNTs) into bulk wires has shown the ability to control electrical conductivity and wire density. Simultaneous use of KAuBr4 doping solution, during wire drawing, has led to an electrical conductivity in the CNT wire of 1.3×106 S/m. Temperature-dependent electrical measurements show that conduction is dominated by fluctuation-assisted tunneling, and introduction of KAuBr4 significantly reduces the tunneling barrier between individual nanotubes. Ultimately, the concomitant doping and densification process leads to closer packed CNTs and a reduced charge transfer barrier, resulting in enhanced bulk electrical conductivity.

[1]  Richard E. Smalley,et al.  Future Global Energy Prosperity: The Terawatt Challenge , 2005 .

[2]  A. B. Kaiser,et al.  Electronic transport properties of conducting polymers and carbon nanotubes , 2001 .

[3]  B. Landi,et al.  High energy density lithium-ion batteries with carbon nanotube anodes , 2010 .

[4]  Matteo Pasquali,et al.  Carbon nanotube-based neat fibers , 2008 .

[5]  Jingcui Peng,et al.  Low-temperature resistance of individual single-walled carbon nanotubes: A theoretical estimation , 2001 .

[6]  T. N. Todorov,et al.  Carbon nanotubes as long ballistic conductors , 1998, Nature.

[7]  W. Ma,et al.  Highly dense and perfectly aligned single-walled carbon nanotubes fabricated by diamond wire drawing dies. , 2008, Nano letters.

[8]  Ya-Li Li,et al.  Direct Spinning of Carbon Nanotube Fibers from Chemical Vapor Deposition Synthesis , 2004, Science.

[9]  A. Halliday,et al.  Core formation on Mars and differentiated asteroids , 1997, Nature.

[10]  T. Takenobu,et al.  Enhancement of Carrier Hopping by Doping in Single Walled Carbon Nanotube Films(Condensed matter: electronic structure and electrical, magnetic, and optical properties) , 2008 .

[11]  Viera Skakalova,et al.  Modelling conduction in carbon nanotube networks with different thickness, chemical treatment and irradiation , 2008 .

[12]  Jao van de Lagemaat,et al.  Reversibility, dopant desorption, and tunneling in the temperature-dependent conductivity of type-separated, conductive carbon nanotube networks. , 2008, ACS nano.

[13]  S. Messenger,et al.  Radiation effects in single-walled carbon nanotube papers , 2010 .

[14]  P. Poulin,et al.  Macroscopic fibers and ribbons of oriented carbon nanotubes. , 2000, Science.

[15]  E. Brown,et al.  Ballistic thermal and electrical conductance measurements on individual multiwall carbon nanotubes , 2005 .

[16]  K. R. Atkinson,et al.  Multifunctional Carbon Nanotube Yarns by Downsizing an Ancient Technology , 2004, Science.

[17]  F. Froes.  Advanced metals for aerospace and automotive use , 1994 .

[18]  Sarunya Bangsaruntip,et al.  Spontaneous reduction of metal ions on the sidewalls of carbon nanotubes. , 2002, Journal of the American Chemical Society.

[19]  Dekker,et al.  High-field electrical transport in single-wall carbon nanotubes , 1999, Physical review letters.

[20]  A. B. Kaiser,et al.  Effect of chemical treatment on electrical conductivity, infrared absorption, and Raman spectra of single-walled carbon nanotubes. , 2005, The journal of physical chemistry. B.